Sphere cooling by radiation in surroundings: cooling rate at a new temperature (Stefan's law)

1. A.
   $\frac{3}{16}R$
2. B.
   $\frac{9}{16}R$
3. C.
   $\frac{16}{9}R$
4. D.
   $\frac{16}{3}R$

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1. A.
   6.2
2. B.
   5.3
3. C.
   4.8
4. D.
   7.4

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1. A.
   $\ 4R_{0}$
2. B.
   $\ 16R_{0}$
3. C.
   $36R_{0}$
4. D.
   $\frac{81R_{0}}{16}$

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1. A.
   $\dfrac{15}{16}R_1$
2. B.
   $\dfrac{11}{16}R_1$
3. C.
   $\dfrac{7}{16}R_1$
4. D.
   $\dfrac{3}{16}R_1$

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1. A.
   $\dfrac{16}{3}R$
2. B.
   $\dfrac{16}{9}R$
3. C.
   $\dfrac{9}{16}R$
4. D.
   $\dfrac{3}{16}R$

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1. A.
   $50R$
2. B.
   $45R$
3. C.
   $40R$
4. D.
   $35R$

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